如何将函数作为参数传递给AsynTask [英] How to pass function as paramater to AsynTask

问题描述

因为我是android开发中的新手，所以我需要为我的http请求提供asynctask类.我在一个活动中有很多http请求函数类型，并且我想使其动态化.所以我只想创建一个可以运行我所有功能的AsyncTask函数.

since im new in android development, and i need to provide an asynctask class for my http request. i have a lot of http request function type in one activity, and i want to make it dynamic. so i wanted to create only one AsyncTask function that can run all my function.

这就是例子

  private class WebServiceCall extends AsyncTask<Void, Void, Void> {
    @Override
    protected void onPreExecute() {
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
                WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
        pBar.setVisibility(View.VISIBLE);
        pBar.setIndeterminate(false);
        pBar.setClickable(false);
    }
    @Override
    protected Void doInBackground(Void... params) {
        // a function that i passed
       Function01();
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        try{
         some code
            }
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
        pBar.setClickable(true);
        pBar.setVisibility(View.GONE);
    }

}

我只是这样打电话

Oncreate(
new WebServiceCall().execute(function01());

)

任何帮助和代码示例将不胜感激， 谢谢

any help and code sample would be appreciate, thanks

推荐答案

我不知道您将function用作另一个函数的参数的意思！

I don't know what you mean by a function as a parameter to another function!

，但是您可以使用Interfaces来实现此目的.

but you can use Interfaces for this purpose.

例如:

创建一个可以在onPostExecute()

public interface ResponseCallback {

    void onRespond();
}

，在调用asynckTask之前，请像这样定义它:

and before calling asynckTask define it like this:

   ResponseCallback callback = new ResponseCallback() {
            @Override
            public void onRespond() {
              //code to be done after calling it from onPostExecute
            }
        };

并将callback传递到asynckTask的constructor并在onPostExecute

当然，您可以将interface的签名修改为所需的内容.

of course you can modify the signature of the interface to what ever you want.

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